LED Bulb Options for Backup Bulb WT21W

[testa422]

To sum it up - since there is constant confusion between reserve lights and brake/turn lights.

Reverse lights: WT21W - available from Alla or Diode Dynamics
plug and play, no resistor required

Brake/turn lights: WT21W/7W - available from Alla or DD (as 4257)
-can be either white or red (since housing is red)
-will require a 6 ohm resistor to be spliced in to remedy hyper flashing.. be careful where you install a resistor as they will get hot and could melt components

splicing a resistor will not affect the entire vehicle warranty or even the taillight, but may if the dealer points to the mod. as being the source...

source: Magnuson-Moss Warranty Act, a vehicle manufacturer cannot void the warranty of your vehicle due to an aftermarket part unless they can prove that the aftermarket part was the cause of or contributed to the failure of the vehicle (15 U.S.C. 2302 (C)). This means that a vehicle's warranty cannot be "voided;" the dealer can only deny a claim if the stock part failed due to damage or unreasonable use.

Too add to this…I would go with a RED led for brakes. Always get the same color led as the color of the lens otherwise the colors will be weak and look “off”

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[felsf50]

If I install WT21W red bulbs in the third brake light I should not need resistors since it not a switchback. Correct?

 

[sdy284]

If I install WT21W red bulbs in the third brake light I should not need resistors since it not a switchback. Correct?

Switchback has nothing to do with it. It's led vs incandescent and the different resistance over the different types of bulbs that can cause hyper flash or error light issues.

That being said 3rd brake light and reverse lights are not monitored by computer, so the change in resistance doesn't have any annoying side effects.

So no, you don't need resistors for 3rd brake light

 

[abjbrtd]

If I install WT21W red bulbs in the third brake light I should not need resistors since it not a switchback. Correct?

Switchback has nothing to do with it. It's led vs incandescent and the different resistance over the different types of bulbs that can cause hyper flash or error light issues.

That being said 3rd brake light and reverse lights are not monitored by computer, so the change in resistance doesn't have any annoying side effects.

So no, you don't need resistors for 3rd brake light

If $ and looks are important then take a look at this high mounted brake light, it's cheaper than 3 sets of WT21W bulbs

 

[huunvubu]

Has anyone tried these:

6000k WT21W LED Reverse Backup Light Bulbs for 2021 2022 Ford F150 F250 STX XLT

EDIT 3/4/2022: These DO NOT FIT

 

[OTACORB]

Has anyone tried these:

6000k WT21W LED Reverse Backup Light Bulbs for 2021 2022 Ford F150 F250 STX XLT

Specification:

Brand: SHENKENUO
Bulb Model: 3157 3156 3457 4157 3057
Color: 6000K Xenon White
Application: Tail Light Daytime Running Lights(DRL) ,turn signal light
INSTALLATION: Professional installation is highly recommended
Cross Reference: 3156 3056 3156A 3456 4156 3157 3157A 3047 3057 3357 3457 3457A 3757 4057 4111 4157,4157NA,3157LL,3356, 4157, 4114,3157A, T25, etc.

Feature:

1. 100% Brand new & never used
2. Plug&Play
3. Super Bright
4. IP65 Waterproof
5. Strong Heat Dissipation
6. 3157 SMD LED Bulbs: Pefect replacement for car reverse backup light, DRL, brake light, turn signal light.
7. CANBUS ERROR FREE: No. For some vehicles, it may require install decoder or load resistor to avoid flash or fast blinking.
8. Length: as photos.
9. Please Note: Please check your car manual or original bulb to confirm the bulb size, length is correct or not before purchasing to save your time.

Description:

This listing features one pair ( 2 pieces) extremely super bright 3157 6000K high power led bulbs, especially designed for replacing Reverse Backup Light.This bulb will make your cars looks much brighter than halogen or stock lamp,highly recommended.

Never heard of them, but they sure look cheap, but looks can be deceiving so who knows. Personally I prefered the more expensive tried and true Lasfit or Alla LED's.

 

[Maguffin]

Sylvania ZEVO bulbs

I bought the Sylvania 921 LED last night and they work great, much better light for bed now.

 

[DoubleR]

I believe resistors are needed for turn signal bulbs. To eliminate "Hyperflash". Other bulbs just need to be "Can Bus" specific to eliminate dash warning light that bulb is out.

 

[DoubleR]

update, the wt21w/7w led bulb works for both tail light (lower light emitted) and brake light/turn signal (highest light emitted)... the lights do not hyperflash but the turn signal sound/display goes at twice the speed in the cab

twice the speed is "Hyperflshing"....

 

[bigcat1185]

Are far as the roof mounted third brake light, are the red brake lights WT21W/7W and the white parking lights are 912?

 

[DoubleR]

Are far as the roof mounted third brake light, are the red brake lights WT21W/7W and the white parking lights are 912?

I believe all the bulbs in the cargo/3rd brakelight assembly are 921/912s... The WT21W/7W are dual element bulbs in the brakelight rear assemblies, basically a 3057 bulb. Tail/Brake/Turn signal bulbs.

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